单项选择题

It is high time we ______ this practice.

A．stop
B．stopped
C．have stopped
D．had stopped
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单项选择题
The teacher ______ the students clean the laboratory.
A．asked
B．told
C．let
D．wanted
单项选择题
Tom was embarrassed for he could not think of any ______ excuse for his absence at the meeting.
A．reason
B．reasons
C．reasonable
D．reasonableness
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